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Old 9th October 2019, 09:29 PM   #31
pan53 is offline pan53  Austria
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H hh hi, Maty,
Ja, oui, yesss, sí señor, you arrr rright,

Dynavoxxx ! Hick!


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Old 11th October 2019, 10:23 AM   #32
pan53 is offline pan53  Austria
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Default hum from the speakers

I have a little hum problem from my saksa and I can't find the references to appropriate measures to get rid of it. In a distance of 1 m I can hear a distinct noise in my speakers. It is not only a clean low 50 or 100 Hz sinus hum but contains also a "scratchy" component. (Don't know how to describe it better)

Currently I run the yellow earthing cable from my saksa to a bolt I fixed to the subchassis of my enclosure. From there I run another earthing cable to the earth terminal of my IEC mains socket.

Is there a tried and tested procedure to follow to minimise this noise? Are the earthing cables still just to close to the transformer?

Should I turn around the module so that the heatsink is between PCB and transformers?

Should I position the grounding bolt to another part of the enclosure?

Is it important that the distance from the grounding bolt is the same for both modules (the second module is going to arrive soon) ?
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Last edited by pan53; 11th October 2019 at 10:28 AM.
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Old 11th October 2019, 10:34 AM   #33
AKSA is offline AKSA  Australia
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Peter,

If you disconnect your input RCAs, do you still have the hum?

Try one, then the other to see.

Hugh
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Old 11th October 2019, 10:43 AM   #34
pan53 is offline pan53  Austria
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If I disconnect the RCAs, the hum looses some of the "scratchy" (higher frequency) component and becomes a cleaner hum. The lessening of audibility is about 30 to 40%.
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Old 11th October 2019, 11:12 AM   #35
AKSA is offline AKSA  Australia
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Peter,

Try disconnecting the green earth wire from the chassis earth. (Pull off the spade on the pcb connection, easiest to do.)
Before you do this, test that there is 10R resistance from RCA ground (disconnected from source) to chassis earth.

Hugh
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Last edited by AKSA; 11th October 2019 at 11:29 AM.
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Old 11th October 2019, 11:28 AM   #36
pan53 is offline pan53  Austria
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Location: Burgenland
Thanks, Hugh I will do that. Now (13:30 local time) I have to leave to pay a visit, will do it at night (in about 6 hours) and report back.
Peter
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